Clipboard fix 

Fixes issue #1410, #568
* The package size of the format list package in '''cliprdr_process_format_list_event''' was calculated incorrectly, resulting in error responses from the server.
* The error handling in case of a error response from the server was commented out (and out of sync with current master). The purpose of posting the event '''CliprdrChannel_MonitorReady''' is to retry clipboard format negotiation and data transfer with the server. The message sequence can be found at http://msdn.microsoft.com/en-us/library/hh872154.aspx